Theorem psubclssatN 37071

Description: A closed projective subspace is a set of atoms. (Contributed by NM, 25-Jan-2012.) (New usage is discouraged.)

Hypotheses

Ref	Expression
psubclssat.a	⊢ 𝐴 = (Atoms‘𝐾)
psubclssat.c	⊢ 𝐶 = (PSubCl‘𝐾)

Assertion

Ref	Expression
psubclssatN	⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Proof of Theorem psubclssatN

Step	Hyp	Ref	Expression
1		psubclssat.a	. . 3 ⊢ 𝐴 = (Atoms‘𝐾)
2		eqid 2821	. . 3 ⊢ (⊥𝑃‘𝐾) = (⊥𝑃‘𝐾)
3		psubclssat.c	. . 3 ⊢ 𝐶 = (PSubCl‘𝐾)
4	1, 2, 3	psubcliN 37068	. 2 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → (𝑋 ⊆ 𝐴 ∧ ((⊥𝑃‘𝐾)‘((⊥𝑃‘𝐾)‘𝑋)) = 𝑋))
5	4	simpld 497	1 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1533   ∈ wcel 2110   ⊆ wss 3935  ‘cfv 6349  Atomscatm 36393  ⊥_𝑃cpolN 37032  PSubClcpscN 37064

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5059  df-opab 5121  df-mpt 5139  df-id 5454  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-iota 6308  df-fun 6351  df-fv 6357  df-psubclN 37065

This theorem is referenced by:  pmapidclN  37072  psubclinN  37078  paddatclN  37079  pclfinclN  37080  poml6N  37085  osumcllem3N  37088  osumcllem9N  37094  osumcllem11N  37096  osumclN  37097